3Doku brings the traditional Sudoku game to the
third dimension. In a 9x9x9 cube, 27 Sudoku
schemas intersect one another along the three
axis. Every 9x9 bi-dimensional schema must be
solved, keeping in mind that every single cell
belongs to the selected schema and also to the
other two placed on the orthogonal planes. With 4
difficulty levels and 4 initial values
distributions, you can customize your game and
have every time a new exciting challenge to solve.

AIMSpy is an application that parses and displays
content from instant messaging systems using the
local network. It is multi-threaded, uses BPF
devices for network access, and includes fairly
thorough support for the AIM chat protocol and
rudimentary support for the Rendezvous (iChat)
protocol.

ARIS (Augmented Reality and Interactive Storytelling) is a tool for you to make mobile games, tours, and interactive stories. Using the GPS and QR Codes, ARIS players can be presented with a virtual world of interactive characters, items, and media placed in physical space.

ActiveDeveloper is an incremental runtime Objective-C and C IDE, JIT compiler, and debugger for Cocoa and QuickTime. It features fast incremental Objective-C and C compilation, full native speed applications in deployment, and no ActiveDeveloper dependency in your products.

ActoTracker is an application for keeping track of activities on your desktop so that you don't have to. Think of it as an app for bookmarking desktop documents and applications. It can also bookmark things that are not usually tied to a URL such as Outlook email message or Filemaker records. It can be extended to handle additional applications by writing custom AppleScript plugins. ActoTracker is somewhat inspired by the GNOME Activity Journal (Zeitgeist framework), and it tries to solve a similar kind of problem for the end user, although in a different way.

Address Book Server allows you to share your
contacts and calendar events with others connected
to your network or over the Internet. Each
participant synchronizes their contacts with the
server hosted on your own system. Address Book
Server supports the full Address Book and iCal
schema. The server also provides a friendly Web
interface and an iPhone client which let you
access your contact details remotely.

AddressBook X LDAP provides a shared addressbook
on your local network, without the burden of
subscriptions. It is an iSync enabled application
which transfers contacts from the AddressBook to a
central LDAP directory. It also provides the
ability to browse and search the directory.
Multiple schema mappings are available and can be
customized and extended to address individual
needs. Currently, ABxLDAP Person (an extension to
InetOrgPerson) is fully supported, but the Mozilla
Schema and the basic InetOrgPerson are in
development. Support for Active Directory is
included as well.

Addresses is a GNUstep address book that consists
of a full-featured address book manager
application, a source-code compatible replacement
for Apple's AddressBook.framework (for accessing
and manipulating address data programmatically), a
framework of view/editor classes that make it easy
to use Addresses from your own programs, and a
number of tools. It is easy to use by both users
and programmers and can store almost all
imaginable data, including multiple phone numbers,
emails, and addresses, photos,
AIM/Jabber/ICQ/Yahoo IM details, and notes. It
supports drag-and-drop and integrates well with
GNUMail.